Finally! I remember seeing astronauts giving tours of the space shuttle on kid's shows when I was little, and every last one of them would say "and you do NOT want to know how the space toilet works." God damn it, you can't say things like that to a curious six year old and expect him not to wonder.
Earlier in the space race, NASA developed a really elaborate space toilet while the Russian Cosmonauts were just told to shit in their suits. The whole space race was that way. For example Astronauts were given a nice parachute landing with multiple failsafes while the Russian landing was screaming plummet to the ground with a last second reverse thruster.
And he's just completely serious the whole time. And he talks about eating floating poop, and he focuses on the health aspect. Astronauts pretty much kick ass, even if they are all addicted to Tang.